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<div class="title">src/contextFree/parser/ParserFactory.java</div>  </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="keyword">package </span>contextFree.parser;
<a name="l00002"></a>00002 
<a name="l00003"></a>00003 
<a name="l00004"></a>00004 <span class="keyword">import</span> inputParser.AbstractInputParser;
<a name="l00005"></a>00005 <span class="keyword">import</span> inputParser.InputParser;
<a name="l00006"></a>00006 
<a name="l00007"></a>00007 <span class="keyword">import</span> java.io.BufferedReader;
<a name="l00008"></a>00008 <span class="keyword">import</span> java.io.IOException;
<a name="l00009"></a>00009 <span class="keyword">import</span> java.io.InputStreamReader;
<a name="l00010"></a>00010 
<a name="l00011"></a>00011 <span class="keyword">import</span> org.apache.log4j.Logger;
<a name="l00012"></a>00012 
<a name="l00013"></a>00013 
<a name="l00014"></a>00014 <span class="keyword">import</span> contextFree.grammar.IGrammar;
<a name="l00015"></a>00015 
<a name="l00016"></a><a class="code" href="classcontext_free_1_1parser_1_1_parser_factory.html">00016</a> <span class="keyword">public</span> <span class="keyword">class </span><a class="code" href="classcontext_free_1_1parser_1_1_parser_factory.html">ParserFactory</a> {
<a name="l00017"></a>00017         <span class="keyword">static</span> Logger logger = Logger.getLogger(<a class="code" href="classcontext_free_1_1parser_1_1_parser_factory.html">ParserFactory</a>.class.getName());
<a name="l00018"></a>00018         
<a name="l00019"></a>00019         <span class="keyword">public</span> <span class="keyword">static</span> <a class="code" href="interfacecontext_free_1_1parser_1_1_i_parser.html">IParser</a> createParser(){
<a name="l00020"></a>00020                 System.out.println(<span class="stringliteral">&quot;E&#39; necessario inserire una grammatica[indicare il file]:&quot;</span>);
<a name="l00021"></a>00021                 <span class="keywordflow">try</span> {
<a name="l00022"></a>00022                         <a class="code" href="classinput_parser_1_1_abstract_input_parser.html">AbstractInputParser</a> parser = <span class="keyword">new</span> <a class="code" href="classinput_parser_1_1_input_parser.html" title="An object rappresentation of input file parsing result.">InputParser</a>(<span class="keyword">new</span> BufferedReader(<span class="keyword">new</span> InputStreamReader(System.in)).readLine());
<a name="l00023"></a>00023                         <a class="code" href="interfacecontext_free_1_1parser_1_1_i_parser.html">IParser</a> l = <span class="keyword">new</span> <a class="code" href="classcontext_free_1_1parser_1_1_l_a_l_r1.html">LALR1</a>((<a class="code" href="interfacecontext_free_1_1grammar_1_1_i_grammar.html" title="Grammar Interface.">IGrammar</a>)parser.<a class="code" href="classinput_parser_1_1_abstract_input_parser.html#a548b0f6fa44b7954b79bdd964336bafe" title="Execute the parse operation on the object.">parse</a>());
<a name="l00024"></a>00024                         <span class="keywordflow">if</span>(l.init()==1) {
<a name="l00025"></a>00025                                 logger.debug(<span class="stringliteral">&quot;Grammar created and initialized correctly&quot;</span>);
<a name="l00026"></a>00026                         }
<a name="l00027"></a>00027                         <span class="keywordflow">else</span> {
<a name="l00028"></a>00028                                 System.out.println(<span class="stringliteral">&quot;\n!!!!ATTENZIONE: La grammatica non e&#39; di tipo LALR(1)...&quot;</span>);
<a name="l00029"></a>00029                         }
<a name="l00030"></a>00030                         <span class="keywordflow">return</span> l;
<a name="l00031"></a>00031 
<a name="l00032"></a>00032                 } <span class="keywordflow">catch</span> (IOException e) {
<a name="l00033"></a>00033                         logger.debug(<span class="stringliteral">&quot;Input read error&quot;</span>);
<a name="l00034"></a>00034                         e.printStackTrace();
<a name="l00035"></a>00035                         <span class="keywordflow">return</span> null;
<a name="l00036"></a>00036                 }<span class="keywordflow">catch</span> (Exception e) {
<a name="l00037"></a>00037                         <span class="keywordflow">return</span> null;
<a name="l00038"></a>00038                 }
<a name="l00039"></a>00039         }
<a name="l00040"></a>00040         
<a name="l00041"></a>00041         <span class="keyword">public</span> <span class="keyword">static</span> <a class="code" href="interfacecontext_free_1_1parser_1_1_i_parser.html">IParser</a> createParser(<a class="code" href="classinput_parser_1_1_abstract_input_parser.html">AbstractInputParser</a> parser){
<a name="l00042"></a>00042                 <a class="code" href="interfacecontext_free_1_1parser_1_1_i_parser.html">IParser</a> l;
<a name="l00043"></a>00043                 <span class="keywordflow">try</span> {
<a name="l00044"></a>00044                         logger.debug(<span class="stringliteral">&quot;Grammar type init...&quot;</span>);
<a name="l00045"></a>00045                         l = <span class="keyword">new</span> <a class="code" href="classcontext_free_1_1parser_1_1_l_a_l_r1.html">LALR1</a>((<a class="code" href="interfacecontext_free_1_1grammar_1_1_i_grammar.html" title="Grammar Interface.">IGrammar</a>)parser.<a class="code" href="classinput_parser_1_1_abstract_input_parser.html#a548b0f6fa44b7954b79bdd964336bafe" title="Execute the parse operation on the object.">parse</a>());
<a name="l00046"></a>00046                         <span class="keywordflow">if</span>(l.init()==1) {
<a name="l00047"></a>00047                                 logger.debug(<span class="stringliteral">&quot;Grammar created and initialized correctly&quot;</span>);
<a name="l00048"></a>00048                         }
<a name="l00049"></a>00049                         <span class="keywordflow">else</span> {
<a name="l00050"></a>00050                                 System.out.println(<span class="stringliteral">&quot;\n!!!!ATTENZIONE: La grammatica non e&#39; di tipo LALR(1)...&quot;</span>);
<a name="l00051"></a>00051                         }
<a name="l00052"></a>00052                         <span class="keywordflow">return</span> l;
<a name="l00053"></a>00053                 } <span class="keywordflow">catch</span> (Exception e) {
<a name="l00054"></a>00054                         logger.error(<span class="stringliteral">&quot;Error occurred in grammar initialization&quot;</span>);
<a name="l00055"></a>00055                         e.printStackTrace();
<a name="l00056"></a>00056                         <span class="keywordflow">return</span> null;
<a name="l00057"></a>00057                 }
<a name="l00058"></a>00058         }
<a name="l00059"></a>00059 
<a name="l00060"></a>00060         <span class="keyword">public</span> <span class="keyword">static</span> <a class="code" href="interfacecontext_free_1_1parser_1_1_i_parser.html">IParser</a> createParser(<a class="code" href="interfacecontext_free_1_1grammar_1_1_i_grammar.html" title="Grammar Interface.">IGrammar</a> grammar) {
<a name="l00061"></a>00061                 <a class="code" href="interfacecontext_free_1_1parser_1_1_i_parser.html">IParser</a> l;
<a name="l00062"></a>00062                 <span class="keywordflow">try</span> {
<a name="l00063"></a>00063                         logger.debug(<span class="stringliteral">&quot;Grammar type init...&quot;</span>);
<a name="l00064"></a>00064                         l = <span class="keyword">new</span> <a class="code" href="classcontext_free_1_1parser_1_1_l_a_l_r1.html">LALR1</a>(grammar);
<a name="l00065"></a>00065                         <span class="keywordflow">if</span>(l.init()==1) {
<a name="l00066"></a>00066                                 logger.debug(<span class="stringliteral">&quot;Grammar created and initialized correctly&quot;</span>);
<a name="l00067"></a>00067                 <span class="comment">//se la grammatica e&#39; di tipo LALR(1) ritorna l&#39;istanza</span>
<a name="l00068"></a>00068                         }<span class="keywordflow">else</span> {
<a name="l00069"></a>00069                                 System.out.println(<span class="stringliteral">&quot;\n!!!!!!ATTENZIONE: La grammatica non e&#39; di tipo LALR(1)...&quot;</span>);
<a name="l00070"></a>00070                         }
<a name="l00071"></a>00071                         <span class="keywordflow">return</span> l;
<a name="l00072"></a>00072                 } <span class="keywordflow">catch</span> (Exception e) {
<a name="l00073"></a>00073                         logger.error(<span class="stringliteral">&quot;Error occurred in grammar initialization&quot;</span>);
<a name="l00074"></a>00074                         e.printStackTrace();
<a name="l00075"></a>00075                         <span class="keywordflow">return</span> null;
<a name="l00076"></a>00076                 }
<a name="l00077"></a>00077         }
<a name="l00078"></a>00078 }
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